Abstract
Deuterium, δ 18O, major ions and dissolved silica in groundwater from semi-arid Mayo-Tsanaga river basin in the Far North Province, Cameroon were used to trace hydrogeochemical processes that control their concentrations and to explore for usability of the water. Electrical conductivity ranges from 57–2,581 μs/cm with alternating low and high values along the hydraulic gradient. Waters from piedmont alluvium show low concentrations in major cations, which peak in Mg within basalt, Na within plain alluvium, and Ca within basalt and the sandy Limani-Yagoua ridge. The initial dominant groundwater composition is CaHCO3, which did not evolve within the basalt and piedmont alluvium, but evolved to NaHCO3 in the granite and plain alluvium. The main processes controlling the major ions composition include the following: (1) dissolution of silicates and fluorite; (2) precipitation of fluorite and carbonate; (3) cation exchange of Ca in water for Na in clay; (4) and anthropogenic activities. The δD and δ 18O ratios vary from −35 to 0.7 and −5.3 to 1.1‰, respectively. The lowest and highest isotope ratios are observed in groundwater within the downstream sandy Limani-Yagoua ridge and the upstream graintes respectively. Variation in isotope ratios depends on altitude effect of −0.48‰ per 100 m between 600 and 850 m asl, and on evaporation, which had insignificant effect on the water salinity. Seventy percent of the groundwater shows poor drinking quality and 90% is suitable for irrigation.
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254_2008_1629_MOESM3_ESM.tif
Plots showing variation of Na (Fig. 3a), Ca (Fig. 3b), Mg (Fig. 3c) K (Fig. 3d), F (Fig. 3e) and dissolved silica (3f) in groundwater within different rock types in study area (TIFF 21 kb)
254_2008_1629_MOESM4_ESM.tif
Plots showing variation of Na (Fig. 3a), Ca (Fig. 3b), Mg (Fig. 3c) K (Fig. 3d), F (Fig. 3e) and dissolved silica (3f) in groundwater within different rock types in study area (TIFF 25 kb)
254_2008_1629_MOESM5_ESM.tif
Plots showing variation of Na (Fig. 3a), Ca (Fig. 3b), Mg (Fig. 3c) K (Fig. 3d), F (Fig. 3e) and dissolved silica (3f) in groundwater within different rock types in study area (TIFF 22 kb)
254_2008_1629_MOESM6_ESM.tif
Plots showing variation of Na (Fig. 3a), Ca (Fig. 3b), Mg (Fig. 3c) K (Fig. 3d), F (Fig. 3e) and dissolved silica (3f) in groundwater within different rock types in study area[INSERT CAPTION HERE] (TIFF 21 kb)
254_2008_1629_MOESM7_ESM.tif
Plots showing variation of Na (Fig. 3a), Ca (Fig. 3b), Mg (Fig. 3c) K (Fig. 3d), F (Fig. 3e) and dissolved silica (3f) in groundwater within different rock types in study area (TIFF 21 kb)
254_2008_1629_MOESM8_ESM.tif
Plots showing variation of Na (Fig. 3a), Ca (Fig. 3b), Mg (Fig. 3c) K (Fig. 3d), F (Fig. 3e) and dissolved silica (3f) in groundwater within different rock types in study area (TIFF 19 kb)
254_2008_1629_MOESM11_ESM.tif
Variation of d-excess in groundwater as a function of altitude. The clusters ‘A’, ‘B’, and ‘C’ in figure 7 are observed (TIFF 63 kb)
254_2008_1629_MOESM12_ESM.tif
b. Saturation index with respect to fluorite showing that group 1 groundwater were undersaturated, while group 2 were supersaturated thus posing dissolution threat with time (TIFF 22 kb)
254_2008_1629_MOESM13_ESM.tif
a. Na/Ca ratio (meq/L) against fluoride (meq/L), showing a positive correlation and clustering the groundwater into groups 1 and 2 (TIFF 21 kb)
254_2008_1629_MOESM14_ESM.tif
Plots of groundwater samples in (a) Na2O- Al2O3- SiO2- H2O and (b) CaO-Al2O3-SiO2-H2O systems at 25°C. Thermodynamic data used in constructing these diagrams are those given in Fritz (1976) (TIFF 24 kb)
254_2008_1629_MOESM15_ESM.tif
Plots of groundwater samples in (a) Na2O- Al2O3- SiO2- H2O and (b) CaO-Al2O3-SiO2-H2O systems at 25°C. Thermodynamic data used in constructing these diagrams are those given in Fritz (1976) (TIFF 27 kb)
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Fantong, W.Y., Satake, H., Ayonghe, S.N. et al. Hydrogeochemical controls and usability of groundwater in the semi-arid Mayo Tsanaga River Basin: far north province, Cameroon. Environ Geol 58, 1281–1293 (2009). https://doi.org/10.1007/s00254-008-1629-x
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DOI: https://doi.org/10.1007/s00254-008-1629-x